Henbane Seed Classic Formulas … Natural Herb Library

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Relieves spasm and severe pain - Tian Xian Zi is used for sharp abdominal pain, stomach or intestinal cramping, toothache, wind-damp pain, and traumatic pain where spasm and obstruction are pronounced.
Calms coughing and wheezing by relieving spasm - older practice includes minute-dose internal use or smoke use for stubborn asthma-like cough with tightness.
Calms the spirit and settles convulsive disorders - traditional use extends to mania, fright epilepsy, and severe agitation patterns.

Tian Xian Zi Wan from the Saint Ji tradition - warming stop-diarrhea use for chronic cold diarrhea and prolapse patterns.
Miao Gong San - pairing with Da Huang for dysenteric pain and tenesmus when obstruction and lingering pathogen coexist.
Lang Dang Zi San - older sedating strategy for mania, convulsions, or seizure-like presentations.
Toothache powders, smoke applications, or point use - classic external direction for severe dental pain.

Official Chinese herb references describe Tian Xian Zi as bitter, acrid, warm, and highly toxic, entering the Heart, Liver, and Stomach to stop spasm and pain and calm convulsive disorders.
Classical literature repeatedly highlights toothache, spasmodic abdominal pain, wheezing, chronic diarrhea, prolapse, and mania-like states as its main indication clusters.
The decisive traditional fact is not only efficacy but danger: internal doses are tiny and continuous use is specifically discouraged.